Elementary Statistics (Text Only)
2nd Edition
ISBN: 9780077836351
Author: Author
Publisher: McGraw Hill
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 10.2, Problem 14E
Computers in the classroom: In a new experimental teaching method, when students have questions in class, they send them to the instructor via a laptop computer. From time to time, the instructor pauses to read the questions and to provide the answers, without revealing the identities of the students who are asking the questions. This new method is supposed to eliminate the reluctance of students to ask questions for fear of revealing their lack of understanding in public. In a study of this new method, 67 male students and 72 female students participated. Treat these as if they were simple random samples. Of the male students, 38 said that they liked the new method better than the traditional one in which students raise their hands to ask questions. Of the female students, only 22 said they liked the new method better.
- Construct a 95% confidence interval for the difference between the proportions of male and female students Who like the new method better.
- An educator claims that the proportion of students who like the new method better is the same for males and females. Does the confidence interval contradict this claim?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
As you read about each study, (a) classify the type of research that it reflects, and (b) identify the kinds of conclusions that might reasonably be drawn from the results.
The director of computer technology in Emerson School District wants to gather information about the use of technology-based instruction in language arts and literature classes in the district's middle schools and high schools. For her study, the director identifies five of the top teachers in these content areas. She visits and observes each teacher's classes on three different days and subsequently interviews each teacher. Then she summarizes the ways that these teachers incorporate the use of technology into their lessons and their students' activities. The director also summarizes teachers' beliefs about the roles of technology in students' learning and motivation.
(a) Classify the research as one of the following:
Quantitative/descriptive
Quantitative/correlational…
Help, please!
Despite the availability of several modes of transportation, including metro and ride-booking services, most people in the Washington, D.C., area continue to drive their own cars to get around (The Washington Post, June 6, 2019). According to a survey, 62% of area adults use their own cars daily. Suppose only 38% of the area’s adults under 35 use their own cars daily. It is known that 43% of the area’s adults are under 35.
What is the probability that a Washington, D.C., area adult is under 35 and uses his/her own car daily?
If a Washington, D.C., area adult uses his/her own car daily, what is the probability that he/she is under 35?
Chapter 10 Solutions
Elementary Statistics (Text Only)
Ch. 10.1 - In Exercises 5 and 6, fill in each blank with e...Ch. 10.1 - In Exercises 5 and 6, fill in each blank with e...Ch. 10.1 - Prob. 7ECh. 10.1 - Prob. 8ECh. 10.1 - In Exercises 9-14, construct the confidence...Ch. 10.1 - Prob. 10ECh. 10.1 - In Exercises 9-14, construct the confidence...Ch. 10.1 - Prob. 12ECh. 10.1 - Prob. 13ECh. 10.1 - Prob. 14E
Ch. 10.1 - Does this diet help? A group of 78 people enrolled...Ch. 10.1 - Contaminated water: The concentration of benzene...Ch. 10.1 - Fertilizer: In an agricultural experiment, the...Ch. 10.1 - Computer crashes: A computer system administrator...Ch. 10.1 - Are you smarter than your older brother? In a...Ch. 10.1 - Effectiveness of distance learning: A study was...Ch. 10.1 - Boys and girls: The National Health Statistics...Ch. 10.1 - Body mass index: In a survey of adults with...Ch. 10.1 - Energy drinks: A survey of college students...Ch. 10.1 - Low-fat or low-carb? Are low-fat diets or low-carb...Ch. 10.1 - Online testing: Do you prefer taking tests on...Ch. 10.1 - Drive safely: How often does the average driver...Ch. 10.1 - Interpret calculator display: The following TI-84...Ch. 10.1 - Prob. 28ECh. 10.1 - Prob. 29ECh. 10.1 - Prob. 30ECh. 10.1 - Prob. 31ECh. 10.2 - In Exercises 3 and 4, fill in each blank with the...Ch. 10.2 - Prob. 4ECh. 10.2 - Prob. 5ECh. 10.2 - Prob. 6ECh. 10.2 - In Exercises 7-12, construct the confidence...Ch. 10.2 - In Exercises 7-12, construct the confidence...Ch. 10.2 - In Exercises 7-12, construct the confidence...Ch. 10.2 - In Exercises 7-12, construct the confidence...Ch. 10.2 - In Exercises 7-12, construct the confidence...Ch. 10.2 - Prob. 12ECh. 10.2 - Traffic accidents: Traffic engineers compared...Ch. 10.2 - Computers in the classroom: In a new experimental...Ch. 10.2 - Pain after surgery: In a random sample of 50...Ch. 10.2 - Pretzels: In order to judge the effectiveness of...Ch. 10.2 - Defective electronics: A team of designers was...Ch. 10.2 - Prob. 18ECh. 10.2 - Cancer prevention: Colonoscopy is a medical...Ch. 10.2 - Social media: A Pew poll found that in a sample of...Ch. 10.2 - Interpret calculator display: The following TI-84...Ch. 10.2 - Prob. 22ECh. 10.2 - Prob. 23ECh. 10.2 - Prob. 24ECh. 10.2 - Finding the sample size: Polls are to be conducted...Ch. 10.3 - In Exercises 3 and 4, fill in each blank with the...Ch. 10.3 - Prob. 4ECh. 10.3 - Prob. 5ECh. 10.3 - In Exercises 5 and 6, determine whether the...Ch. 10.3 - Fast computer: microprocessors are compared on a...Ch. 10.3 - Brake wear: For a sample of 9 automobiles, the...Ch. 10.3 - Strength of concrete: The compressive strength, m...Ch. 10.3 - Truck pollution: In an experiment to determine the...Ch. 10.3 - High cholesterol: A group of eight individuals...Ch. 10.3 - Tires and fuel economy: A tire manufacturer is...Ch. 10.3 - Prob. 13ECh. 10.3 - Prob. 14ECh. 10.3 - Interpret calculator display: The following TI-84...Ch. 10.3 - Interpret calculator display: The following TI-84...Ch. 10.3 - Prob. 17ECh. 10.3 - Prob. 18ECh. 10.3 - Advantage of matched pairs: Refer to Exercise 12....Ch. 10.3 - Paired or independent? To construct a confidence...Ch. 10 - In Exercises 1 and 2, determine whether the...Ch. 10 - Prob. 2CQCh. 10 - Prob. 3CQCh. 10 - Prob. 4CQCh. 10 - Prob. 5CQCh. 10 - Prob. 6CQCh. 10 - Prob. 7CQCh. 10 - Prob. 8CQCh. 10 - Prob. 9CQCh. 10 - Prob. 10CQCh. 10 - Prob. 11CQCh. 10 - Refer to Exercise 11. Find the critical value for...Ch. 10 - Prob. 13CQCh. 10 - Prob. 14CQCh. 10 - Prob. 15CQCh. 10 - Prob. 1RECh. 10 - Prob. 2RECh. 10 - Prob. 3RECh. 10 - Prob. 4RECh. 10 - Prob. 5RECh. 10 - Prob. 6RECh. 10 - Prob. 7RECh. 10 - Prob. 8RECh. 10 - Prob. 9RECh. 10 - Prob. 10RECh. 10 - Prob. 11RECh. 10 - Prob. 12RECh. 10 - Prob. 13RECh. 10 - Prob. 14RECh. 10 - Prob. 15RECh. 10 - Prob. 1WAICh. 10 - Prob. 2WAICh. 10 - Prob. 3WAICh. 10 - Prob. 4WAICh. 10 - Prob. 1CSCh. 10 - Prob. 2CSCh. 10 - Prob. 3CS
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.Similar questions
- Does advertising influence children as young as three? Researchers at Stanford University conducted a taste test with preschoolers. Each preschooler tasted two identical samples of five food items (hamburger, french fries, chicken nuggets, baby carrots, and apple slices). For each item, the children tasted one sample wrapped in a McDonald's wrapper and the other sample in an identical, but unbranded, wrapper. Some children tasted the sample in the branded wrapper first, others tasted the sample in the unbranded wrapper first. Consistently for all food items, the majority of preschoolers preferred the food in the McDonald's wrapper over the one in the unbranded wrapper, even though both samples were identical. [Source: Robinson, T. N., et al. "Effects of fast food branding on young children's taste preferences." Archives of Pediatrics & Adolescent Medicine 161 C2007): 792–797]. The researchers found that the preschoolers who watched more television or ate more often at McDonald's were…arrow_forwardWHAT IS THE BEST WAY TO GO ABOUT FINDING A JOB? After completing a college degree, graduates are faced with the important project of finding a job. Options include networking through friends and relatives, pursuing newspaper ads, applying in person, conducting an Internet job search, using a professional employment agency or recruiter, and using a college placement office. Some of these avenues are likely to be much more productive than others. Specifically, networking has been found to be one of the most productive approaches. With networking, a job seeker develops contacts and exchanges information through an informal network of people. One recent survey involved 703 randomly selected subjects who were all working. Among those subjects, 61% said that they found their job through networking (based on data from Taylor Nelson Sofres Intersearch). Another effective approach appeared to be newspaper ads, with 16% of the respondents finding jobs through such ads. Based on these survey…arrow_forward20 families brought food, costumes, and crafts, 31 families brought food and crafts; 55 families brought food; 47 families brought crafts; 20 families brought crafts but not costurnes; 11 families brought none of the three items3; 24 families brought costumes but not crafts. At a pow-wow, 98 families came to participate in the ceremonies. A coordinator of the pow-wow took a survey and found the results shown to the right. Answer parts (a) through (e) below. (a) How many families brought costumes and food? There were families. (b) How many families brought costumes? There were families. (c) How many families brought food, but did not bring costumes? There were families. (d) How many families did not bring crafts? There were families. (e) How many families brought food or costumes? There were families. er your answer in each of the answer boxes.arrow_forward
- Brad J. Bushman, a psychologist at Ohio State University, studied the impact of watching violence on memory. For example, he found that watching violent television programs impairs a person’s ability to remember the details of commercials. You decide to explore this issue by having three different groups try recalling details from a commercial played while watching videos. The first group watched violent videos, the second group watched sexual videos, and the third group watched nonviolent, nonsexual videos. The sample mean and sum of squares of the scores for each of the three groups are presented in the following table. Group Sample Mean Sum of Squares Violent videos 94.1 9,467.2900 Sexual videos 108.7 7,903.2100 Nonviolent, nonsexual videos 111.4 8,667.6100 After collecting the data, you analyze the data using an ANOVA. The results of your analysis are presented in the following ANOVA table. ANOVA Table Source of Variation SS df MS F Between Treatments 8,662.34 2 4,331.17 24.45…arrow_forwardA college finds that 12% of students have taken a distance learning class, 24% of students arepart-time students, and of the part-time students, 25% have taken a distance learning class.(a) What percentage of students are both part-time and have taken a distance learning class?(b) What percentage of the students who have taken a distance learning class are part-time?arrow_forwardDriving would be more pleasant if we didn't have to put up with the bad habits of other drivers. A newspaper reported the results of a Valvoline Oil Company survey of 500 drivers in which the drivers marked their complaints about other drivers. The top complaints turned out to be tailgating, marked by 24% of the respondents; not using turn signals, marked by 20%; being cut off, marked by 13%; other drivers driving too slowly, marked by 10%; and other drivers being inconsiderate marked by 5%. (a) Make a Pareto chart showing percentage of drivers listing each stated complaint. (choose one of the options) (b) Could this information as reported be put in a circle graph? A. Since the percentages do not add to 100%, a circle graph cannot be used. If we create an "other" category and assume that all other respondents fit this category, then a circle could be created. B. Since the percentages add to 100%, a circle graph can be used. C. Since the categories overlap, a circle graph cannot be…arrow_forward
- A university counselor believes that hypnosis is more effective than the standard treatment given to students who have high test anxiety. To test his belief, he randomly divides 22 students with high test anxiety into two groups. One of the groups receives the hypnosis treatment, and the other group receives the standard treatment. When the treatments are concluded, each student is given a test anxiety questionnaire. High scores on the questionnaire indicate high anxiety. The following are the results: Hypnosis Treatment Standard Treatment 20 42 21 35 33 30 40 53 24 57 43 26 48 37 31 30 22 51 44 62 30 59 a) What is the alternative hypothesis? Assume there is sufficient basis for a directional hypothesis. b) What is the null hypothesis? c) Using the Mann-Whitney U test and α = 0.051tail, what do you conclude?arrow_forwardIn an the researcher interacts and influences the behavior of the subjects. In an Observational Study; Observational Study Designed Experiment; Designed Experiment Designed Experiment; Observational Study Observational Study; Designed Experiment the researcher observes the subjects and makes no effort to interact or influence the subjects.arrow_forwardAs the price of oil rises, there is increased worldwide interest in alternate sources of energy. The Financial Times/Harris Poll surveyed people in six countries to assess attitudes toward a variety of alternate forms of energy. The data in the following table are a portion of the poll's findings concerning whether people favor or oppose the building of new nuclear power plants.arrow_forward
- A researcher is interested in whether completing a six-week speed-reading course designed for sighted readers affects reading speed among blind Braille readers. She has blind adults complete a reading speed test before and after a six-week speed-reading course. The researcher randomly selects a sample of 50 blind Braille readers who, at the beginning of the study, scored an average of 261 words per minute on the reading speed test. After the speed-reading course, the blind Braille readers scored an average of 7 words per minute higher. The standard deviation of the difference scores was 21. Since the sample size is larger than 30, the researcher can assume that the sampling distribution of MD is normal. She uses a repeated-measures t test to test that the mean difference is zero, and she describes the results as follows: After the speed-reading course, the Braille reading speed among blind Braille readers is significantly different than before taking the course, t(49) = 2.36, p =…arrow_forwardA school psychologist wants to test the effectiveness of a new method of teaching art. She recnuits 700 sixth-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while grouD 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the results of the two groups are compared. Complete parts (a) through (h) below. (a) What is the response variable in this experiment? O A. The score of group 2 on the achievement test O B. The scores on the achievement tests of both group 1 and group 2 O C. The score of group 1 on the achievement test O D. The students' ability in art (b) Is the response variable qualitative or quantitative? O A. The response variable is qualitative because it is a characteristic. O B. The response variable is quantitative because it is a measurement. O C. The response variable is quantitative because it is a characteristic. The…arrow_forwardA professor divided the students in her business class into three groups: those who have never taken a statistics class, those who have taken only one semester of a statistics class, and those who have taken two or more semesters of statistics. The professor randomly assigns students to groups of three to work on a project for the course. 65% of the students have never taken a statistics class, 15% have taken only one semester of a statistics class, and the rest have taken two or more semesters of statistics. Round your answers to three decimal places. a. What is the probability that the first groupmate you meet has studied at least two semesters of statistics? b. What is the probability that the first groupmate you meet has studied some statistics? c. What is the probability that neither of your two groupmates has studied any statistics? d. What is the probability that your two groupmates have studied at least one semester of statistics? e. What is the probability that at least one…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill
Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL
Glencoe Algebra 1, Student Edition, 9780079039897...
Algebra
ISBN:9780079039897
Author:Carter
Publisher:McGraw Hill
Holt Mcdougal Larson Pre-algebra: Student Edition...
Algebra
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Statistics 4.1 Point Estimators; Author: Dr. Jack L. Jackson II;https://www.youtube.com/watch?v=2MrI0J8XCEE;License: Standard YouTube License, CC-BY
Statistics 101: Point Estimators; Author: Brandon Foltz;https://www.youtube.com/watch?v=4v41z3HwLaM;License: Standard YouTube License, CC-BY
Central limit theorem; Author: 365 Data Science;https://www.youtube.com/watch?v=b5xQmk9veZ4;License: Standard YouTube License, CC-BY
Point Estimate Definition & Example; Author: Prof. Essa;https://www.youtube.com/watch?v=OTVwtvQmSn0;License: Standard Youtube License
Point Estimation; Author: Vamsidhar Ambatipudi;https://www.youtube.com/watch?v=flqhlM2bZWc;License: Standard Youtube License